Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e34b01cf3453bfe…

MALICIOUS

PDF

69.6 KB Created: 2021-01-13 07:15:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 23ab1c4b9439e768ea151b2fd3b7b2cb SHA-1: 1c9b64e8b6ed206babe23823289019da7775ffa3 SHA-256: 6e34b01cf3453bfe4fcf4877101af3589a6c0b45d748480c43bba824cd599ced
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains strings related to game ROMs, suggesting a lure to attract users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/123?utm_term=pokemon+gold+rom+hack In PDF document text
    • https://gikenizebos.weebly.com/uploads/1/3/4/7/134706738/d38cd8b91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5fb3f8258535f.pdfIn PDF document text
    • https://site-1168117.mozfiles.com/files/1168117/stupid_zombies_2.pdfIn PDF document text
    • https://cdn.sqhk.co/xonoguduzob/hcjd1ha/thoroughly_enjoyed_something_crossword.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dofufiri/druid_cantrips_5e_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/lodash_template_if_else.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/lilegotonuxezotobeli.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/coroplast_sheet_thickness.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/93258097835.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/goldsmith_ff14_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD445 5240 bytes
SHA-256: 88c88fe4f8652d6fbeb9894ce797805e7c37c1a37341459370644eb78302aad1
font_01_sfnt_off0000e5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 10744 bytes
SHA-256: 46795f16ca0e557ce941c487d171f39c43fd5e7027ef8130dec4ef5d9f441cf9

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